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Assuming the car battery is ok (if not, buy a male to male cigarette lighter at the auto store and connect to another car until charged enough to unlock the doors...but don't try to crank the ignition!). The trunks won't open if the battery went dead with the alarm set because arming the alarm physically locks the releases.
Sounds like the key code is switched off because you replaced the key fob battery. Try unlocking the car manual with the key in the door lock. Then switch the ignition on to reactive the keyless entry. If this does not work, you might also try pressing the fob unlock button with the key in the door lock until the dash led flashes.
This is a known issue with these vehicles and results vary with a solution.
Try spraying the key with WD40 and spray wd40 inside the key opening and insert the key into the cylinder. Then wiggle the key around and turn slightly left to right to see if you can get it pop. You may have a strike plate that is out of alignment.
Also,try having someone push down hard on the trunk while turning the lock to open.
Have you tried unlocking the rear seat to allow access to the trunk? there is a manual cable/switch that will most likely have a bright colored end, pull this switch to manually open,I'm not real sure what side it is on in the trunk.
Programming When Key added or replaced. System malfunction. How Obtain all keys. A maximum of 3 keys can be programmed. Close all doors and boot/tailgate. Switch ignition ON. Repeat procedure below 3 times: Within 4 seconds: Press key lock or unlock button. Within 4 seconds: Switch ignition OFF. Within 4 seconds: Switch ignition ON. Within 4 seconds: Press key lock or unlock button. System should now lock or unlock vehicle. Within 4 seconds: Press key lock or unlock button. Within 10 seconds: Press lock or unlock button of first key. System should now lock or unlock vehicle. Press lock or unlock button of second key. System should now lock or unlock vehicle. Press lock or unlock button of third key. System should now lock or unlock vehicle. Switch ignition OFF. Remove key. Check operation of all programmed keys. NOTE: If less than 3 keys are to be programmed, remove ignition key after programming last key.
hi there i have a mercury cougar 1987 and they are the same thing if your car at the door ajar is a keyboard search at ther trunk the code to open de car and then try to open the trunk check the open mechanism on the trunk sometimes is unplug or clean it a little bit if it donesnt work yo may buy the button at a yunk yard. the manual is only for sale at your local store like kragen, pepboys autozone etc. i bought at one of those places
I simply opened the bonnet. Connected the battery charge positive to the + feed on the back of the alternator, connected the negative to the body. Turned it on, immediately the interior light comes on. Turn on the ignition press the cabin boot switch and it opens the boot. Charge battery as normal. Easy Peezy